Welding jig

Abstract

To provide a welding jig capable of guiding a traveling type welding device along a welding line.SOLUTION: A welding jig 10 is used to guide traveling of a welding device WR when fillet weld is performed while traveling the traveling-type welding device WR with respect to a base material plate BS1, a first orthogonal plate BS2, and a second orthogonal plate BS3 held by a base-material rotating jig 20. The welding jig 10 includes a first guide plate 11 that extends in parallel along the base material plate BS1 and guides the traveling of the welding device WR along the base material plate BS1, and a second guide plate 14 that extends in parallel along the first orthogonal plate BS2 and guides the traveling of the welding device WR along the first orthogonal plate BS2, and the first guide plate 11 has a second guide plate support portion 13 that abuts on the base-material rotating jig 20 and supports the second guide plate 14 so as to be displaceable with respect to the first guide plate 11 at a predetermined position with respect to the base-material rotating jig 20.SELECTED DRAWING: Figure 2

Description

[Technical Field]

[0001] The present invention relates to a welding jig, and more particularly to a welding jig used when welding work is performed using a traveling welding device. [Background technology]

[0002] Conventionally, reinforcing members called brace sheets have been used at the column-beam joints of steel frame structures, which are made up of columns and beams, in order to suppress deformation of the frame and improve the strength of the building. The brace sheet is a cross plate that includes a base plate as the base material and a pair of orthogonal plates that are ink-welded to the base plate so that they intersect and are joined to the base plate at their end faces.

[0003] The fillet welding must be performed from both sides along the joining end faces of the base plate and the orthogonal plate. Therefore, a total of four welding operations are required to weld the pair of orthogonal plates to the base plate, and there is a need to reduce the time and effort required for the welding operation. Patent Document 1 describes a welding robot that can fillet weld an orthogonal plate to a base plate. The welding robot can automatically perform welding work by driving a welding torch along a welding line connecting a preset welding start point and welding end point. Therefore, by utilizing a welding robot, the workload associated with welding work can be reduced. [Prior art documents] [Patent documents]

[0004] [Patent Document 1] International Publication No. 2019 / 171706 Summary of the Invention [Problem to be solved by the invention]

[0005] Although the welding robot described in Patent Document 1 automates welding work and reduces the burden on workers, further improvements are desired. Specifically, brace sheets used as reinforcing members for steel frame structures require high strength and durability for the welded parts. To achieve this, the welding robot needs to travel accurately along the weld line while maintaining a predetermined distance between the welded part and the tip of the welding torch.

[0006] The present invention has been made in view of the above-mentioned problems, and an object of the present invention is to provide a welding jig that can guide a traveling welding device along a welding line. [Means for solving the problem]

[0007] The above problem is solved by the welding jig of the present invention, which is a welding jig used to guide the movement of a traveling welding device when fillet welding is performed while the welding device is traveling against first and second base materials held by a base material holding jig, and which comprises: a first guide plate that abuts against the first base material, extends parallel to the first base material, and guides the movement of the welding device along the first base material; and a second guide plate that abuts against the second base material, extends parallel to the second base material, and guides the movement of the welding device along the second base material, and the first guide plate abuts against the base material holding jig and has a second guide plate support portion that supports the second guide plate at a predetermined position relative to the base material holding jig so that the second guide plate can be displaced relative to the first guide plate.

[0008] According to the above configuration, the welding jig includes a first guide plate and a second guide plate that guide the welding jig along the first base material and the second base material, and the second guide plate is supported at a predetermined position by a second guide plate support portion that abuts against the base material holding jig that holds the base materials so as to be displaceable relative to the first guide plate. As a result, the first guide plate and the second guide plate extend parallel to the first base material and the second base material, respectively, and the second guide plate is held in an appropriate position without being deformed by the load of the first guide plate. This makes it possible to guide the traveling welding device along the weld line where the first base material and the second base material are joined.

[0009] In addition, the second guide plate may be supported by the second guide plate support portion so as to be slidable at a position spaced apart from the base material holding jig by a distance corresponding to the thickness of the second base material in a direction perpendicular to the second guide plate. According to the above configuration, the second guide plate, which is held at a position spaced a distance from the base material holding jig equal to the thickness of the second base material, can slide according to the thickness of the second base material, making it possible to flexibly accommodate second base materials of various thicknesses and guide the welding device along the welding line.

[0010] The first guide plate may have the second guide plate support portions at both ends in the direction in which the welding device travels. According to the above configuration, the second guide plate support portions are provided near the start and end portions along which the welding device travels, so that the welding device is held in an appropriate position relative to the welding line from the start to the end portions, making it possible to guide the traveling welding device along the welding line.

[0011] The second guide plate support portion may include an elastic member that biases the second guide plate in a direction approaching the second base material. According to the above configuration, the second guide plate is biased by the elastic member in a direction approaching the second base material, so that the second guide plate can be held at an appropriate position relative to the weld line, thereby making it possible to guide the traveling welding device along the weld line.

[0012] In addition, the welding jig may have an opening at a position opposite the weld that is fillet welded by the welding device when the first guide plate and the second guide plate are abutted against the first base material and the second base material, respectively. According to the above configuration, the traveling welding device guided by the first guide plate and the second guide plate can perform fillet welding through the opening.

[0013] The second guide plate may have a bent piece that is bent in a direction perpendicular to the second guide plate, and the bent piece may extend over the entire length in the direction in which the welding device travels. According to the above configuration, deformation of the second guide plate in a direction perpendicular to the direction in which the welding device travels is suppressed, making it possible to guide the traveling welding device along the welding line.

[0014] The welding jig may include a travel restriction member that restricts the travel range of the welding device and is detachable from the first guide plate or the second guide plate. According to the above configuration, the travel restricting member can be attached to and detached from the first base material or the second base material, so it is possible to prevent the welding device from traveling beyond the travel range. [Effects of the Invention]

[0015] According to the welding jig of the present invention, it is possible to guide a traveling welding device along a welding line. [Brief explanation of the drawings]

[0016] [Figure 1] FIG. 10 is a diagram showing fillet welding to a brace sheet. [Figure 2] FIG. 2 is a cross-sectional view taken along line II-II of FIG. [Figure 3] FIG. [Figure 4] FIG. [Figure 5] FIG. 10 is a perspective view of a base material rotation jig supporting a brace sheet. [Figure 6] FIG. 2 is an enlarged perspective view of a main part of the base material rotating jig. [Figure 7] FIG. 10 is a diagram showing the flow of welding work for a brace sheet. [Figure 8] FIG. 10 is a diagram showing how a welding jig is installed on the brace sheet and the base material rotation jig. DETAILED DESCRIPTION OF THE INVENTION

[0017] A welding jig 10 according to one embodiment of the present invention (hereinafter referred to as the present embodiment) will be described below with reference to Figures 1 to 8. However, the embodiment described below is merely an example to facilitate understanding of the present invention and is not intended to limit the present invention. In other words, the present invention may be modified or improved without departing from the spirit thereof, and of course, the present invention also includes equivalents thereof.

[0018] <Outline of welding work for brace sheet BS> First, an overview of the welding work for the brace sheet BS will be explained. Figures 1 and 2 show fillet welding to a brace sheet BS. The brace sheet BS is a reinforcing member fixed to a beam-column joint to suppress deformation of the column and beam and improve the strength of a steel structure consisting of columns and beams. The brace sheet BS has a base plate BS1 and a first orthogonal plate BS2 and a second orthogonal plate BS3 that join to the base plate BS1 at their end faces. In Figure 1, the first orthogonal plate BS2 and the second orthogonal plate BS3 are tack-welded to the base plate BS1 at opposing positions on one side and the other side of the base plate BS1 so as to intersect perpendicularly with the base plate BS1. The base plate BS1 corresponds to the first base material, and the first orthogonal plate BS2 and the second orthogonal plate BS3 correspond to the second base material.

[0019] 2, the first orthogonal plate BS2 is finally fixed to the base plate BS1 by fillet welding welds WP1 and WP2 located at the inside corners on both sides along the joining end face. Similarly, the second orthogonal plate BS3 is finally fixed to the base plate BS1 by fillet welding welds WP3 and WP4 located at the inside corners on both sides along the joining end face.

[0020] The welding device WR is a traveling welding device that travels along the base plate BS1, first orthogonal plate BS2, and second orthogonal plate BS3, and performs fillet welding on a weld line consisting of welds WP1, WP2, WP3, and WP4. More specifically, the welding device WR includes a welding device main body WR1, a welding torch WR2, a lower wheel WR3, and a side wheel WR4. The operator inputs the required settings into the welding device main body WR1. This allows the welding device WR to perform fillet welding while traveling from the welding start point to the welding end point, with the tip of the welding torch WR2 in close proximity to the welds WP1, WP2, WP3, and WP4. The welding device main body WR1 also incorporates an electromagnet for attraction, allowing it to travel stably along a metal welding jig 10. The base plate BS1, first orthogonal plate BS2, and second orthogonal plate BS3 of the brace sheet BS are inclined 45 degrees relative to the horizontal. Therefore, the welding device WR travels with the lower wheel WR3 and the side wheel WR4 in contact with a welding jig 10, which will be described later.

[0021] The welding jig 10 is used to guide the movement of the welding device WR. Specifically, the welding jig 10 has a first guide plate 11 and a second guide plate 14. The first guide plate 11 functions as a running surface for the lower wheel WR3, and the second guide plate 14 functions as a running surface for the side wheel WR4. The first guide plate 11 extends parallel to the base plate BS1, while the second guide plate 14 extends parallel to the first orthogonal plate BS2. Therefore, the first guide plate 11 guides the movement of the welding device WR along the base plate BS1, and the second guide plate 14 guides the movement of the welding device WR along the first orthogonal plate BS2. As a result, the welding jig 10, which is composed of the first guide plate 11 and the second guide plate 14, can guide the welding device WR to move along the weld line (weld portion WP1) located at the inside corner of the base plate BS1 and the first orthogonal plate BS2.

[0022] 2, the heavy first guide plate 11 is supported by the base plate BS1 and a holding pipe 21 of a base material rotating jig 20, which will be described later. As will be described later, the second guide plate 14 is connected to the first guide plate 11 so as to be displaceable relative to the first guide plate 11. This prevents the second guide plate 14 from being deformed when the load of the heavy first guide plate 11 is applied to the second guide plate 14. Therefore, the second guide plate 14 extends parallel to the first orthogonal plate BS2, and can guide the welding device WR to travel accurately along the welding line.

[0023] The base material rotation jig 20 is a rotation jig that rotatably holds the brace sheet BS in the direction indicated by arrow A in Fig. 2 in order to sequentially weld the welds WP1, WP2, WP3, and WP4. In more detail, the base material rotation jig 20 has multiple holding pipes 21 that hold the brace sheet BS in a clamped state, and the brace sheet BS is rotatably supported by rotating the holding pipes 21. The base material rotation jig 20 corresponds to a base material holding jig.

[0024] The base material rotation jig 20 initially supports the brace sheet BS at an angle so that the welded portion WP1 faces upward. At this time, the base plate BS1 and the first orthogonal plate BS2 are inclined at an angle of 45 degrees relative to the horizontal. In addition, the holding pipe 21 facing the welded portion WP1 is removed from the base material rotation jig 20, and the above-mentioned welding jig 10 is installed on the brace sheet BS. This allows the welding device WR to perform fillet welding on the welded portion WP1 from above.

[0025] Once welding of welded portion WP1 is complete, the welding equipment WR and welding jig 10 are removed from above the brace sheet BS. The removed holding pipe 21 is attached to the base material rotation jig 20, and the brace sheet BS is rotated 90 degrees so that the welded portion WP2 is supported at an angle facing upward. Next, the holding pipe 21 facing the welded portion WP2 is removed, and the welding equipment WR and welding jig 10 are installed on the brace sheet BS. This allows the welding equipment WR to perform fillet welding on the welded portion WP2 from above. By repeating this process, fillet welding is performed on the welded parts WP1, WP2, WP3, and WP4 in this order.

[0026] As described above, by using the base material rotation jig 20, it is possible to rotate the brace sheet BS weighing 150 kg to 200 kg without using a lifting machine and perform fillet welding on the welds WP1, WP2, WP3, and WP4 in that order. This makes it possible to shorten the work time and reduce the workload when welding the brace sheet BS.

[0027] <Welding jig 10> Next, the welding jig 10 will be described with reference to Figures 3 and 4. Figure 3 is a perspective view of the welding jig 10, and Figure 4 is an exploded perspective view of the welding jig 10. As shown in Figures 3 and 4, the welding jig 10 has a first guide plate 11, a second guide plate 14, and a stopper 18. As described above, the first guide plate 11 and the second guide plate 14 function as a running surface along which the welding device WR runs, and the welding device WR runs along the first guide plate 11 and the second guide plate 14. This allows the welding device WR to run accurately along the welding line.

[0028] <<First guide board 11>> The first guide plate 11 has a first guide body portion 12 and a second guide plate support portion 13. As described above, the first guide body portion 12 guides the travel of the welding device WR. The first guide body 12 is a metal plate-like body and has a base material contact surface 12a that contacts the base plate BS1 or the first orthogonal plate BS2 or the second orthogonal plate BS3, and a first guide surface 12b that serves as a running surface for the lower wheels WR3 of the welding device WR. The base material contact surface 12a and the first guide surface 12b are flat surfaces that face each other. The first guide plate 11 also has connecting portions 12c that connect to a pair of second guide plate support portions 13 at both ends in the longitudinal direction (the direction in which the welding device WR travels). In other words, the second guide plate support portions 13 are provided at both ends in the direction in which the welding device WR travels.

[0029] The second guide plate support portion 13 supports a second guide plate 14 (described later) at a position above the first guide body portion 12 so that the second guide plate 14 can slide relative to the first guide plate 11. Specifically, the second guide plate support portion 13 has a base material rotating jig abutment portion 13a, a sliding guide portion 13b, a sliding restriction portion 13c, and a coil spring 13d. The base material rotating jig abutment portion 13a is bent perpendicularly to the first guide body portion 12 and supports the second guide plate 14 so that the lower end of the second guide plate 14 is positioned above the first guide surface 12b. Therefore, an opening 17, which will be described later, is formed between the first guide plate 11 and the second guide plate 14.

[0030] Furthermore, when the welding jig 10 is placed on the brace sheet BS, the base material rotating jig abutment portion 13a receives the load of the first guide plate 11, which is a heavy object (see FIGS. 2 and 8), and prevents the load from being applied to the second guide plate 14. This prevents the second guide plate 14 from deforming, and enables the welding device WR to travel along the welding line.

[0031] The sliding guide portion 13b is a long member that guides the sliding of the second guide plate 14 in a direction perpendicular to the base material contact surface 15a of the second guide plate 14. As described below, the second guide plate 14 has a through hole 15c and is guided by the sliding guide portion 13b to slide. A sliding restriction portion 13c is attached to the tip of the sliding guide portion 13b, and a coil spring 13d is interposed between the base material rotation jig contact portion 13a and the sliding restriction portion 13c. Therefore, the sliding range of the second guide plate 14 is restricted by the base material rotation jig contact portion 13a and the sliding restriction portion 13c, and the second guide plate 14 is biased by the coil spring 13d in a direction approaching the base material rotation jig contact portion 13a. As a result, when the base material rotation jig contact portion 13a contacts the base material rotation jig 20 during welding, the second guide plate 14 is supported at a position spaced apart from the base material rotation jig 20 by a distance equal to the thickness of the first orthogonal plate BS2. The coil spring 13d corresponds to an elastic member.

[0032] <<Second Sign 14>> The second guide plate 14 is a metal plate-like body that has been bent. The second guide plate 14 has a second guide body portion 15 and a bent piece 16 located at the upper end of the second guide body portion 15. As described above, the second guide body portion 15 guides the travel of the welding device WR. The second guide body portion 15 has a base material contact surface 15a that contacts the base plate BS1 or the first orthogonal plate BS2 or the second orthogonal plate BS3, and a second guide surface 15b that serves as a travel surface for the side wheels WR4 of the welding device WR. The base material contact surface 15a and the second guide surface 15b are flat surfaces that face each other. The second guide plate 14 is supported by second guide plate support portions 13 at both left and right ends.

[0033] The bent piece 16 extends in the left-right direction (the direction in which the welding device WR travels) over the entire length of the second guide body portion 15. The bent piece 16 is formed by bending the second guide body portion 15. This prevents the second guide plate 14 from being deformed, and enables the welding device WR to travel along the welding line.

[0034] <<Opening 17>> Opening 17 extends in the longitudinal direction of welding jig 10 (the direction in which welding device WR travels) and is interposed between a pair of connecting portions 12c. Opening 17 is formed in a position facing welds WP1, WP2, WP3, and WP4 when welding jig 10 is installed on brace sheet BS. Therefore, welding device WR, which travels while being guided by welding jig 10, can bring welding torch WR2 close to welds WP1, WP2, WP3, and WP4 to perform fillet welding without interfering with welding jig 10.

[0035] <<Stopper 18>> The stopper 18 has a substantially rectangular parallelepiped housing and incorporates a permanent magnet. Therefore, the stopper 18 can be detachably attached to the first guide plate 11 or the second guide plate 14 by magnetic force to restrict the travel range of the welding device WR. The stopper 18 also has a gripping portion 18a, which allows an operator to grasp the gripping portion 18a and easily remove the stopper 18 from the first guide plate 11 or the second guide plate 14. In FIG. 1 , the stopper 18 is attached to the first guide plate 11, but is not limited thereto. It may also be attached to the second guide plate 14 as long as it can restrict the travel of the welding device WR. The stopper 18 corresponds to a travel restricting member.

[0036] <Base material rotation jig 20> Next, the base material rotation jig 20 will be described with reference to Figures 5 and 6. Figure 5 is an overall perspective view of the base material rotation jig 20, and Figure 6 is an enlarged perspective view of the main parts of the base material rotation jig 20. The base material rotation jig 20 includes four holding pipes 21 that hold the brace sheet BS, a rotating member 22, a bearing member 27, and a rotation restricting member 28.

[0037] <<Holding pipe 21>> The holding pipes 21 are arranged on both sides of the first orthogonal plate BS2 and the second orthogonal plate BS3 so as to extend along the weld line (see FIG. 2), and are long shaft members that hold the brace sheet BS. The holding pipes 21 are round pipes with a circular cross-sectional shape. By using round pipes for the holding pipes 21, interference between the holding pipes 21 and thick portions (weld beads) created by welding can be prevented, and the brace sheet BS can be stably held.

[0038] <<Rotating member 22>> Next, we will explain the rotating member 22. The rotating member 22 mainly comprises a rotating shaft 23, a connecting plate 24, a pipe connector 25, and a fastener 26, and serves to rotate the four holding pipes 21 and the brace sheet BS around the rotating shaft 23.

[0039] The rotating shaft 23 is a long shaft member that is rotatably supported by a bearing member 27 (described later) and functions as the rotation center of the base material rotating jig 20. The rotating shaft 23 extends in the same direction as the axial direction of the holding pipe 21. The connecting plate 24 is a connecting member that connects the rotating shaft 23 and the four holding pipes 21. Explaining in more detail, the connecting plate 24 is a circular plate-shaped member (circular plate) that connects to the rotating shaft 23 at its center, while four pipe connectors 25 that connect to the tips of the four holding pipes 21 are attached to its periphery. The four pipe connectors 25 are attached to the periphery of the connecting plate 24 at positions spaced 90 degrees apart from one another.

[0040] The pipe connector 25 has a U-shaped fitting groove 25a that can fit onto the tip of the holding pipe 21. Therefore, the worker can fix the holding pipe 21 to the pipe connector 25 by fitting the tip of the holding pipe 21 into the fitting groove 25a of the pipe connector 25 and fastening the fastener 26.

[0041] The four fasteners 26 can be fastened from directions that differ by 90 degrees from one another to fix the ends of the holding pipes 21 to the pipe connector 25. Furthermore, the fitting grooves 25a of the pipe connector 25 described above are formed so that the holding pipes 21 can be fitted into them from directions that differ by 90 degrees from one another. Therefore, the work of attaching and detaching the four holding pipes 21 can be performed by rotating the rotating member 22 90 degrees at a time around the rotating shaft 23 while operating the fasteners 26 to attach and detach the holding pipes 21, in the same procedure. This makes it easy to attach and detach the holding pipes 21, improving workability.

[0042] Four through holes 24a are formed in the connecting plate 24. The through holes 24a have a size that allows slide rods 28a of a rotation restricting member 28, which will be described later, to enter. The rotation restricting member 28 and the slide rods 28a will be described later with reference to FIG.

[0043] <<Bearing member 27>> Next, the bearing member 27 will be described with reference to Fig. 6. The bearing member 27 has a ball bearing that rotatably supports the rotation shaft 23 relative to the support base ST. Therefore, it is possible to rotatably support the brace sheet BS, which has a large weight. However, without being limited to this, the bearing member 27 may have a roller bearing as long as it can rotatably support the brace sheet BS.

[0044] <<Rotation restriction member 28>> Next, the rotation restricting member 28 will be described. The rotation restricting member 28 can restrict or release the restriction on the rotation of the rotating member 22. More specifically, the rotation restricting member 28 has a slide rod 28a and an operating handle 28b. The operator can restrict the rotation of the connecting plate 24 by operating and rotating the operating handle 28b to slide the slide rod 28a and insert it into the through-hole 24a of the connecting plate 24. The operator can also release the restriction on the rotation of the connecting plate 24 by operating the operating handle 28b to slide the slide rod 28a and retract it from the through-hole 24a of the connecting plate 24.

[0045] The rotation restricting members 28 are arranged side by side at positions sandwiching the rotation shaft 23, and the slide rods 28a can be inserted into the two through holes 24a formed at positions spaced 180 degrees apart from each other. This makes it possible to restrict the rotation of the connecting plate 24 more reliably.

[0046] <Brace sheet BS welding work flow> Next, the flow of the welding work for the brace sheet BS will be described. The welding work is performed in the order of the welded parts WP1, WP2, WP3, and WP4 described with reference to FIG. Fig. 7 shows the flow of welding work for the brace sheet BS. As shown in Fig. 7, first, the worker supports the brace sheet BS with a base material rotating jig 20 (step S10). Specifically, the worker clamps the brace sheet BS with a holding pipe 21 and connects the holding pipe 21 to a rotating member 22. As a result, the brace sheet BS is rotatably supported by the base material rotating jig 20.

[0047] Next, the worker removes the holding pipe 21 facing the welded portion WP1 from the rotating member 22 (step S11). Specifically, the worker rotates the operation knob 26a to pull out the fastener 26, and removes the holding pipe 21 from the pipe connector 25. This prevents the holding pipe 21 from interfering with the welding operation on the welded portion WP1.

[0048] Next, the worker places the welding jig 10 on the brace sheet BS (step S12). FIG. 8 shows the process of placing the welding jig 10 on the brace sheet BS. As shown in FIG. 8, the welding jig 10 is placed on the brace sheet BS by abutting the first guide plate 11 and the second guide plate 14 of the welding jig 10 against the base plate BS1 and the first orthogonal plate BS2. At this time, the second guide plate support portion 13 provided on the first guide plate 11 abuts against the portion of the holding pipe 21 indicated by the symbol P in FIG. 8. This allows the second guide plate 14 to be supported displaceably relative to the first guide plate 11 at a position spaced from the holding pipe 21 by a distance corresponding to the thickness of the first orthogonal plate BS2. Therefore, when the welding jig 10 is rotated to the tilted position shown in FIG. 2, the load of the welding jig 10, which is a heavy object, can be prevented from being concentrated on the abutting portion between the second guide plate 14 and the first orthogonal plate BS2. In addition, since the second guide plate 14 has the bent piece 16, the second guide plate 14 is prevented from deforming in a direction perpendicular to the first orthogonal plate BS2. As a result, the second guide plate 14 extends parallel without deforming, and can guide the welding device WR along the welding line (weld portion WP1).

[0049] In addition, the second guide plate 14 can slide in a direction perpendicular to the first orthogonal plate BS2. Therefore, even if the first orthogonal plate BS2 has a variety of thicknesses depending on the standard, the second guide plate 14 can extend parallel to the first orthogonal plate BS2, making it possible to guide the welding device WR along the welding line.

[0050] Returning to FIG. 7, the worker rotates the brace sheet BS around the rotation axis 23 (step S13). Specifically, the worker rotates the brace sheet BS by manipulating the base plate BS1, the first orthogonal plate BS2, or the second orthogonal plate BS3 so that the welded portion WP1 is positioned upward. As a result, the base plate BS1, the first orthogonal plate BS2, and the second orthogonal plate BS3 are inclined 45 degrees relative to the horizontal plane. The worker also temporarily fixes the brace sheet BS using the rotation restriction member 28.

[0051] Next, the worker performs welding on the welded portion WP1 (step S14). Specifically, the worker places the welding device WR on the welding jig 10 and runs it along the welded portion WP1 to perform fillet welding of the welded portion WP1. This completes the fixation of the first orthogonal plate BS2 to the base plate BS1. At this time, a stopper 18 may be attached to the first guide plate 11. This makes it possible to restrict the travel range of the welding device WR, which will be described later.

[0052] Figures 1 and 2 show the state in which the welding part WP1 is being welded using the welding device WR. The welding device WR performs fillet welding while traveling with the tip of the welding torch WR2 close to the weld part WP1. The base plate BS1, first orthogonal plate BS2, and second orthogonal plate BS3 of the brace sheet BS are inclined at 45 degrees with respect to the horizontal. This allows the welding device WR to travel stably while keeping the lower wheel WR3 and side wheel WR4 in contact with the base plate BS1 and first orthogonal plate BS2, respectively.

[0053] Next, since the welding work of the welded portion WP2 is not completed (step S15), the worker removes the welding jig 10 (step S16). Specifically, the worker removes the welding device WR, stopper 18, and welding jig 10 that are installed on the brace sheet BS.

[0054] Next, the process returns to S11, and the worker attaches and detaches the holding pipe 21 (step S11). Specifically, the worker attaches the removed holding pipe 21 to a position facing the welded portion WP1, and then removes the holding pipe 21 facing the welded portion WP2 from the rotating member 22.

[0055] Next, the worker places the welding jig 10 on the brace sheet BS (step S12, welding preparation step). Specifically, the welding jig 10 is placed on the brace sheet BS by abutting the first guide plate 11 and the second guide plate 14 against the first orthogonal plate BS2 and the base plate BS1 of the brace sheet BS, respectively. As described above, by abutting the second guide plate support portion 13 against the holding pipe 21, the second guide plate 14 is supported slidably relative to the first guide plate 11 at a position spaced apart from the holding pipe 21 by a distance equal to the thickness of the base plate BS1.

[0056] Next, the worker rotates the brace sheet BS around the rotation axis 23 (step S13). Specifically, the worker rotates the brace sheet BS 90 degrees by operating the base plate BS1, the first orthogonal plate BS2, or the second orthogonal plate BS3 so that the welded portion WP2 is positioned upward. The worker also temporarily fixes the brace sheet BS with the rotation restriction member 28.

[0057] Next, the worker performs welding work on the welded portion WP2 (step S14). Specifically, the worker installs the welding device WR on the welding jig 10 and runs it along the welded portion WP2 to perform fillet welding on the welded portion WP2.

[0058] Subsequently, since the welding work of the welded portion WP3 is not yet completed (step S15), the worker repeats step S16 and steps S11 to S14 to perform the welding work of the welded portion WP3. The worker also repeats step S16 and steps S11 to S14 to perform the welding work on the welded part WP4.

[0059] This completes the fillet welding for welds WP1, WP2, WP3, and WP4, completing the welding work for the brace sheet BS. This allows the traveling welding device WR to be guided along the welding line, enabling the welding device WR to travel accurately along the welding line and perform high-quality fillet welds.

[0060] The above describes a welding jig 10 according to one embodiment of the present invention. However, the above-described embodiment is merely an example to facilitate understanding of the present invention and does not limit the present invention. In the above-described embodiment, the welding jig 10 is described as being used to weld the brace sheet BS, which is a reinforcing member, but is not limited to this. The welding jig 10 of the present invention can be used to weld mutually orthogonal base materials that can be held by the base material rotation jig 20.

[0061] In the above-described embodiment, the welding operation is performed with the base plate BS1, the first orthogonal plate BS2, and the second orthogonal plate BS3 of the brace sheet BS tilted at 45 degrees relative to the horizontal plane, but this is not limiting. As long as the welding device WR can stably travel along the base plate BS1 and the first orthogonal plate BS2 or the second orthogonal plate BS3, the tilt angle relative to the horizontal plane may be an angle other than 45 degrees (for example, 20 degrees, 55 degrees, etc.). [Explanation of symbols]

[0062] 10 Welding jig 11 First Information Board 12 First guide body 12a Base metal contact surface 12b First guide surface 12c connection part 13 Second guide plate support portion 13a Base material rotation jig contact part 13b sliding guide part 13c Sliding control part 13d Coil spring (elastic member) 14 Second Information Board 15 Second guide body 15a Base metal contact surface 15b Second guide surface 15c through hole 16 Bent piece 17 Opening 18 Stopper (travel control member) 18a Gripping part 20 Base material rotation jig (base material holding jig) 21 Retaining pipe 22 Rotating member 23 Rotation axis 24 connecting plate 24a through hole 25 Pipe Connector 25a Fitting groove 26 Fasteners 26a Operation knob 27 Bearing materials 28 Rotation restriction member 28a Slide rod (entrance member) 28b Operating handle (operating member) BS brace sheet BS1 base plate BS2 First orthogonal plate BS3 Second orthogonal plate ST support stand WP1, WP2, WP3, WP4 welds WR welding equipment WR1 welding device body WR2 Welding Torch WR3 lower wheels WR4 side wheels

Claims

1. A welding jig used to guide the travel of a traveling welding device when fillet welding is performed on a first base metal and a second base metal held by a base metal holding jig, the welding device being moved, a first guide plate that is in contact with the first base material, extends parallel to the first base material, and guides the welding device in traveling along the first base material; a second guide plate that is in contact with the second base material, extends parallel to the second base material, and guides the welding device as it travels along the second base material; A welding jig characterized in that the first guide plate abuts against the base material holding jig and has a second guide plate support portion that supports the second guide plate at a predetermined position relative to the base material holding jig so that the second guide plate can be displaced relative to the first guide plate.

2. 2. The welding jig according to claim 1, wherein the second guide plate is supported by the second guide plate support portion so as to be slidable at a position spaced apart from the base material holding jig by a distance equal to the thickness of the second base material in a direction perpendicular to the second guide plate.

3. 3. The welding jig according to claim 2, wherein the first guide plate has the second guide plate support portions at both ends in the direction in which the welding device travels.

4. 4. The welding jig according to claim 3, wherein the second guide plate support portion has an elastic member that biases the second guide plate in a direction approaching the second base material.

5. The welding jig according to claim 1, characterized in that the welding jig has an opening at a position opposite to a weld portion to be fillet welded by the welding device when the first guide plate and the second guide plate are abutted against the first base material and the second base material, respectively.

6. the second guide plate has a bent piece that is bent in a direction perpendicular to the second guide plate, 2. The welding jig according to claim 1, wherein the bent piece extends over the entire length of the welding device in the direction in which the welding device travels.

7. 2. The welding jig according to claim 1, wherein the welding jig includes a travel limiting member that limits the travel range of the welding device and is detachable from the first guide plate or the second guide plate.

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